try tilapia with vita chem if your looking for growth, had my oscars on pellets, blood worms, and brine shrimp until they were about 4" and then switched to frozen fish with vita chem and their rate of growth increased greatly
I feed mine NLS Thera A+ 3mm pellets, Omega One freeze dried shrimps, bloodworms and wafers. I also feed night crawlers and Convict fry for the occasional live treat. I do a 50% water change once a week and sometimes 2 partials depending on what I feed it that particular week. One thing to note, Oscars grow pretty fast as is, but I've always been leery about trying to get my fish to grow too fast in fear of them not living as long.

I starved him for a day and threw in pellets and he doesn't touch them, I feel like I wasted money on these hikari sinking pellets. All he touches now is shrimp and frogs. Do you think I could feed him that as a staple?